A girl with 400 N force runs in a park with a length of 5m. The girl takes 10 seconds to get the end of the park. What is the power done by the boy on this activity?

What is a possible result of higher air temperature caused by global warming

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

Asign is hung between two cables as illustrated below. if the sign weighs 350 n, what is the tension (in n) in each cable?